I use BitDefender Standard just for 2 years on two different systems under Windows XP.
Even on the system with only 256 MB RAM and an AMD Athlon XP+ @ 2 GHz, it runs without any slowdowns. My other system has an AMD Athlon XP+ @ 2,8 GHz with 1024 MB RAM and the performance is great too.

When I look at the taskmanager-window I see about 30 MB RAM in use of the 5 processes that BitDefender runs, but for the performance it seems that it doesn't matter.

I think it depends a little on the system-configuration and maybe the chipset.

I use BitDefender Standard just for 2 years on two different systems under Windows XP.
Even on the system with only 256 MB RAM and an AMD Athlon XP+ @ 2 GHz, it runs without any slowdowns. My other system has an AMD Athlon XP+ @ 2,8 GHz with 1024 MB RAM and the performance is great too.

When I look at the taskmanager-window I see about 30 MB RAM in use of the 5 processes that BitDefender runs, but for the performance it seems that it doesn't matter.

I think it depends a little on the system-configuration and maybe the chipset.

I agree with the others' comments. BD-Standard has excellent detection, updates very often, and I suspect is not too "heavy" on most systems. {On my XP-SP2 system, the three processes "bdmcon.exe, bdnagent.exe, bdss.exe" are using a total of about 20-Megs RAM working-set at the moment. I have 1-Gig RAM on this box so that is no sweat at all.} BD-8 does cause noticeable slowdown when I enable the realtime monitor {RTM} so I keep it as a manual on-demand scanner as I do KAV 4.5. The RTM slowdown may just be a quirk for my system, I dunno. {NAV 2005 is my active RTM}. Hope that helps ..